Glass doorknob



B. MARTIN GLASS DooRKNoB Feb'. 17, 1925. 1,525,556

Filed Jan. 13, 1923 5. MART/N A 7 Tfys Patentedb. 17, 1925.

,BERENT MARTIN, or SAN rmcrso, cmrom GLASS DOORKNOB.

Application mea January 1s, ma sum1 no. 612,426.

To all whom t may conce/m:

Be itl known that I, BnrnaN'r MARTIN, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Glass Doorknobs, of which the following is a specification.

This invention relates to improvements in glass door knobs and resides in the provision of .improved means for fastening glass door lmobs to the knob spindles which means is simple as to construction, inexpensive and such that substitution of a glass,

vor breakable knob, for a knob of other or unbreakable material may be easily .made without necessitating changing the spindles. One of the objects of the invention is to provide glass 4door knob fastening means of the character described which will not only provide for a secure and effective detachable fastening of the knob to the ordina type of knob spindle but protect the kno against breaking or cracking in the event the knob is moved forcibly against the wally and' in the event of an excessive sidewise or other strain or pressure being transmitted to the knob. Y

The present style of glass door knob fastening is one in which the fitting is permanently fastened to the knob and is provided with a screw threaded opening to re-` ceive a screw threaded portion of the spindle, the fitting being held in place by a set Screw. This fastening arrangement perv mits the knob to work loose on the spindle after constant use of the knob or upon continual subjecting of the same to strains and pressures. To equip a door having the metal .or other types of knobs, with glass knobs, it

is necessary to replace the old spindle with a spindle having threaded ends specially adapted for glass knobs. My invention takes into consideration the provision' for fastening glass knobs to the ordinary type of knob spindle without requiring the substitution of the special type of spindle and in this eliminates the necessity of employing specially constructed parts and permits 'of a less expensive fitting of doors with glass knobs and at the same time provides for a protection of the knob against accidental breakage or loosening.

The invention possesses other advantages and features some of which, with the foregoing will be set forth at length in the followin description where I shall outline in fulA that form of the invention which I of my invention, but it is to be understood that I do not limit myself to such form since the invention as expressed in the claims may be embodied in a plurality of forms.

Referring to the' drawing: l

Fig. 1 represents a top plan view of the knob of my invention as applied to a door, part of which latter isshown.

Fig. l2 represents a cross sectional view of the knob of my invention.

Fig. 3 represents an end elevation of the fitting member.

Fig. 4 represents a perspective view of an ordinary type of knob spindle having extra holes provided therein.

Referring to the form of the invention shown in the accompanying drawing, 1 designates a door knob formed of glass or other breakable material which knob is given a fanciful shape and appearance and has a protuberance 2 on its outer face. In the opposite or inner face of the knob there is provided a socket 3 which socket, ad'acent its outer end, is enlarged as at 4 an provided with a series of radial teeth 5 in said enlarged portion. Through the central portion of the knob is a bore or opening 6 adapted to receive a screw 7 which is utilized to fasten the knob in place, said screw having a thin head 8 which is curved and conforms somewhat to the curvature of the protuberance 2, but which projects beyond the protuberance so that it will strike against the wall or other object against which the door is slammed, and protect the knob from being broken or cracked.

A special fitting is provided for attaching the knob to a spindle 9. This fitting comprisesa circular body portion 10 having a reduced extension 11 at its inner end delining a shoulder 12 and also having an annular flange 13 at its outer end. The outer face of the flange is provided with radial teeth 15 which engage and interlock with the teeth 5 in the enlarged portion of the socket in the knob. The flange 13 extends slightly intorand tits snugly in the enlarged ortion 4 of the socket. Projecting outwar l from the central portion of the outer en of the member 10 is a cylindrical protuberance or projection 16 which extends well into but is s aced circumerentially from the walls of t e socket 3. This projection is provided with a central longitudinally disposed screw threaded opening 17 which receives the screw threaded end 18 of the screw 7. Extending longitudinally through the body portion 10 and o ening out through the member 11 is a soc et 19 which is of rectangular outline in cross section, and adapted to receive the spindle 9. This socket extends well into the protuberance or projection 16 and the opening 17 communicates with said socket. Upon tightening the screw 7, the fitting is drawn against the knob until a secure fastening of the knob to the itting is provided and the parts will appear in relations as shown in det-ail in Fig. 2. By having the socket 19y comparatively long, it beinO' as long as the aaing itself less the lengi of the Opening 17, the spindle may be adjusted so that any one of its customary three set screw holes 2O may be brought into registration with an opening 21 provided in said body portion 10. A. set screw 22 is mounted in the opening 21 and is adapted to be turned in any one of the openings 20, dependent upon the adjustment required of the splndie 9. To increase the range of adjustment of the spindle in orderto secure a neat and tight fitting of the knob and its attaching means, I may provide in the spindle, eXtra set screw holes 23 which will extend at right angles to and between the holes 20.

With my type of knob it is only necessary to remove the old knobs and substitute the glass ones of my invention by inserting the ends of the whole spindle into thefitting attached to the knobs and adjusting the ttings so that the set screws may be tightened and the knobs held in place. Should the knob ofmy invention become cracked or broken, it may be readily removed and a new knob easily substituted, whereas with the type of glass knobs which are permanently fastened to the fitting, this type being now generally used, a new fitting has to be employed when the knob breaks. From the foregoing it will be seen that the knob of my invention provides advantages in construction and mode of ap lication over the present styles of glass knobs.

By having the protuberance or rojection 16 com ara-tively long, means 1s rovided for edlectively fixing the screw in such manner that strains and stresses will be-central1y and evenly distributed when the outer end of the screw strikes a wall or other object against which the door is slammed. Aside from providing an effective means for attaching the screw, this projection 16 enables the provision of a long socket for reception of the spindle and thus facilitates the adjustment of the spindle in order that a neat and proper fitting of the knob on the door may be effected. By having the projection 16 spaced from the walls of the socket, all tendency of subjecting the knob to severe strains or to crackingof the knob,

incident to lateral or side pressures on the' knob is eliminated.

claim:

The combination with a glass door knob having a socket extending inwardly from the inner side of the knob and provided with a reduced bore continuing through the knob from the inner end of the socket, said socket being enlarged at its outer end to form an annular recess having teeth o-n its surfaces, and a door knob spindle, of means for attaching the knob to the spindle comprising a member having a spindle socket therein, means for securing the spindle, in the socket, an annular flange on said member extending into said annular recess and provided with teeth cooperating with teeth in said recess, a projection on said member extending forwardly from the Hange into said socket and being spaced from the walls of the socket, said projection having a screw threaded opening therein in alignment with the reduced bore in the knob and a screw in said bore having its threaded end turned in said screw threaded opening and its head engaged with t-he outer face of the knob.

BERENT MARTN. 

